Asphalt expansion-joint.



amen

CHRISTOPHER S. MCGINN, OF ST. LOUIS, MISSOURI.

ASPHALT EXPANSION-JOINT.

No Drawing.

To all whom it may concern:

Be it known that I, CHRISTOPHER S. Mo- Gimv, a citizen of the United States, residing at St. Louis,.in the State of Missouri.

. have invented certain new and useful Improvements in Asphalt Expansion-Joints: and I do' hereby declare the following to be a full. clear, and exact description of the invention, such as wilbenable others skilled in the art .to which it appertains to make and use the same.

This invention relates to paving materials and has special reference 'to a paving of material of elastic character adapted to be used in the expansion joints of brickor other paving.

One object of the invention is to provide a composition for expansion joints of improved character.

With the above and other objects in view as will. be hereinafter apparent the invention consists in general of a novel form of paving material adapted to be used in expanslon joints.

The invention further consists in certain novel details of composition and an improved method of manufacture hereinafter fully described and specifically set forth in the claim.

The material of which these joints are made consists of sand to the extent 'of about 84% and this sand should be fine enough to pass through a screen from 50 to 200 mesh.

To this sand is added4% of lime in the form of a bicarbonate or hydraulic cement, the sand is then heated in a suitable pan to about 200 degrees Fahrenheit. After -the sand has been thus heateddthere is added 12% ofasphalt, cement composed of 50% of asphalt and 50% of residuum or crude petroleum oil. The mixture is then heated to 300 degrees Fahrenheit andturned until thoroughly mixed. At this degree of heat the composition is semi-fluid and may be run into light dusted molds and tamped or rolled so as to form strips about four inches wide and of convenient length to handle.

The process may be varied somewhat by the use of old asphalt which has been torn up in repaved streets; When this is desired the 01d asphalt hasthe place' of a portion Specification of Letters Patent.

of the new asphalt and the sand contained in the old renders it unnecessary to add this to the mixture. In utilizing the old. asphalt a suitable quantity is placed in the mixing pan and about one-half of if of water is added. After this has been heated to3tl0 degrees Fahrenheit there is added 4% citru men composed of of asphalt and 410% of residuum or petroleum oil. The heat is then run up to 300 degrees, the mixture thoroughly stirred run into molds and tamped or rolled as before. In either of these methods the whole mixture may be spread evenly over aplatform and tamped or rolled to the proper thickness.

No matter which method of manufacture is used the resulting mass will consist of 81% of sand, 4% of lime, 6% of asphalt and (3% of petroleum oil or residuum.

It is found that by the specific propow tions used in this composition a material is made which has the peculiar property of spreading out from the strips, when the latter are in position, as the paving blocks on either side thereof are de ressed by the pas sage of wagons and the ike thereover. In other words. the material retains a certain amount of plasticity after its manufacture audits being placed in position.

The composition is found to possess a large degree of elasticity while ut the same time it is sutliciently hard to prevent toorapid wear. The composition is further more water proof.

Bythe use of an increased amount pitch may be substituted for theasphalt so thatthe resulting mixture consists of 82% of sand, 4% of lime. 8% of pitch and 6% of petroleum oil.

Having thus described my invention What is claimed as new, is

' An elastic material for paving, compris ing a mixture of 84% sand, 4% lime, (if/0 asphalt and 6% petroleum oil.

In testimony whereof, I aiiix my signature, in' presence of two witnesses.

CHRISTOPHER S. McGINN.

\Vitnesses:

Wm. B. FITZGERALD, E. W. ERDMANN.

Patented Mar. 1, 191th Application filed May 24, 1909. Serial No. 497,896. 

